Improvement in printing-telegraphs



T. A. EDISON. 4lmpr'ovemenf in Priting-Telegraphs.

Patented sep. 17, 1872.

All

@l o e am" UNITED STATES PATENT GEEIGE.

THOMAS A. EDISON, OF NEWARK, NEW JERSEY.

IMPROVEMENT IN PRINTING-TELEGRAPHS.

To all whom t may concern:

Be it known that I, THOMAS A. EDISON, of Newark, in the county of Essex and State of New Jersey, have invented an Improvement in Printing-Telegraph Instruments; and the following is hereby declared to be a full and correct description of the same.

This instrument is of that class in which two type-wheels, rotated by separate step-by'- step movements, are employed to print in two lines upon one strip of paper. My improvement relates to employing an auxiliary lever and ratchet-wheel in connection with each of the usual type-wheel levers, and these auxiliary levers are so arranged that when either of the type-wheel levers is vibrated by its magnet to rotate thetype-wheel the other typewheel is rotated and brought to unison by means of the auxiliary lever acting upon its ratchet-wheel, and rotating said wheel until its pawl or pallet ceases to turn said wheel, in consequence of a tooth being removed from the same. The space where the tooth is removed from the ratchet-wheel is at a place in such relation to the zero or unison point ofthe 'type-wheel that when said ratchet-wheel stops revolving the type-wheel is at zero, and is in unison with the transmitter, and so remains lready to be brought into action by that instrument.

In the drawing, Figure lis a plan of my improved instrument, and Fig. 2 is a sectional elevation of the same.

a a are the type-wheels secured to the sleeves b b', which revolve upon the stationary shaft c, when actuated by theirrespective electro-magnets d d', through the armatures and levers e e and ratchet-wheels f f. The magnets el d are in inde endent electric circuits, and either type-wheel may be revolved, stopped, and printed from, according to which ,magnet is energized, as heretofore usual. h h are the auxiliary levers upon the shaft or fulcrum i, and l l' are their respective ratchetwheels secured to the sleeves b b and from each wheel Z Z a tooth is removed, as at 2. These levers 7L h are contiguous to the levers e e, and pins m m' project from the same and rest upon said levers h h. When either typewheel is in use-say the wheel @M -its lever e is vibrated by the magnet d', and its pin m will vibrate the auxiliary lever h, and, through the shaft fi, will vibrate 4the lever h and rotate the ratchet-wheel l and its sleeve and type-wheel a.; and said wheel Zwill be rotated until the pawl or pallet of It arrives at the space 2, where the tooth is removed; and said pawl will then move up and down in said space without turning the wheel L, if the lever h continues to be vibrated. The typewheel a is now at zero and in unison with the transmitter, ready to be brought into action by that instrument. The wheel'a, when in use, acts, by its lever e and pin m, to vibrate the lever h', to rotate the ratchet-wheel Z and bring the type-wheel a. to unison.

The printing-lever and its magnet are not shown inthe drawing. They may be of any desired character, and the magnet may be in a separate electric circuit or in a circuit to the magnets d or d. Ordinarily the change in operating thetype-wheelswill take place at the zero-points; hence the levers h 71.' will not be operative unless there has been a loss in the movement of the type-wheel that is thrown out of action. Y

I claim as my invention- Two'type-wheels separately revolved by a step-bystep motion, in combination with a separate lever or levers operated by the mechanism that is moving one type-wheel to set the other type-wheel, substantially as specified.

Signed by me this 15th day of June, A. D.V

T. A. EDISON. Witnesses GEO. T. PINGKNEY, GHAs. H. SMITH. 

